[texworks] Saving file while working?

[David Perry]

In TeXworks, there's that nice little toolbar icon to save the file (and 
of course control-S).  It also appears that the file is automatically 
saved every time you typeset.

I'm fanatical about saving as I go along.  So when TeXworks just 
crashed, I wasn't worried since I had saved multiple times.

But when I restarted TeXworks I found I had lost over an hour of intense 
work.  Looking at the file in Windows Explorer confirmed that the last 
save had taken place over an hour previously.  So does TeXworks not 
really save the file as you work (i.e., it saves it in some temporary 
way and only writes the actual file when the program closes)?  Or was 
this some fluke?  I'm using r. 291 under Vista.

David